5128690666 has 16 divisors (see below), whose sum is σ = 8570966400. Its totient is φ = 2281622080.

The previous prime is 5128690663. The next prime is 5128690681. The reversal of 5128690666 is 6660968215.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (5128690663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2478991 + ... + 2481058.

It is an arithmetic number, because the mean of its divisors is an integer number (535685400).

Almost surely, 2^5128690666 is an apocalyptic number.

5128690666 is a deficient number, since it is larger than the sum of its proper divisors (3442275734).

5128690666 is a wasteful number, since it uses less digits than its factorization.

5128690666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4960109.

The product of its (nonzero) digits is 933120, while the sum is 49.

The square root of 5128690666 is about 71614.8774068629. The cubic root of 5128690666 is about 1724.5223816388.

The spelling of 5128690666 in words is "five billion, one hundred twenty-eight million, six hundred ninety thousand, six hundred sixty-six".